Skate-grinding clamp



Jan. 8, 1 24- 1,480,422

- s. E. STROM SKATE GRINDING CLAMP Filed Feb. 2, 1925 amnion Patented Jan. 8, 1924.

* UNITED STATES 1 1,480,422 PATENT oFFIcE.

svEN E. STBOM, or n'nrnorr, MICHIGAN;

. SKATE-GRINDING CLAMP.

Application filed February 2, 1923. Serial no. 616,482.

larly to an attachment for holdingand grinding ice skates in sharpeningthe same, and the object of the invention is to provide a simple device which may be conveniently attached to grinders as commonly constructed for use in shoe repair shops, whereby an ;ice skate maybe accurately and expeditiously sharpened. i

A further object is to provide an attachment whereby the skate is rigidly held and accurately guided in its longitudinal movementacross .the face of the grinding wheel.

and whereby the skate may be swunglat-.

erally'in its plane of longitudinal movement.

to bring the curved or rounded end portions ofthe skate runner into proper engagement with the grinding wheel while being guided in such movement. It is also an object to :provide means whereby the position of the skate relative to the grinding wheel may be accurately and quickly adjusted and means whereby the grinding operation may be accurately controlled by the operator and the -work moved into and out of engagement with the grinding wheel at will to inspect and control the work and to facilitate the removal and replacement of skates from the device. It is also an object to provide certain. other new and useful features in the construction and arrangement of parts, all' as will hereinafter more full appear.

W1th the above and other ends in View, the lnvention consists in the matters hereinafter set forth and more particularly point-.

ed out in the appended claims, reference being had to the accompanying drawings in which- Fig. 1 is a perspective view of agrinding machine of conventional construction with an attachment illustrative of the invention in operative position thereon; and

Fig. 2 is a transverse section of the same. The attachment illustrative of the invention and shown in the drawing, is shown as applied to a conventional form of grinding machine usually employed in shoe repair shops and comprising suitable supporting frames or standards 1 and 2 carrying a line driving shaft 3 upon which is secured a drive pulley a from which motion is .t'ransmitted by a belt 5 to a pulley 6 on a spindle 7, which spindle is mounted in a suitable head or frame '8 formed integral with or secured to thestandard 1:in any suitable manner. On one end of the spindle 7 is a" suitable grinding wheel 9 to rotate with the spindle.

The attachment illustrative of the invenf tion comprises a rigid frame formed of a heavy rod or shaft bent into U-shape to provide parallel straight'portions 10 and 11 connected at one end; bya connecting portion 12 and to securethis guide frame to the grinding machine, a bracket 13' is adjustablyland detachably secured to a suit-.

able part of the head 8 by the engagement of therounded shank portion or stem of the bracket within an opening in the frame'and securing the same in place by-a set screwlt.

The outer end of this bracket is formed wlth an eye or hearing 15 to receive the free end ofthestraight portion 11 of the guide frame. This frame is supported at its connected orv closedend 12 by a suitable supporting arm comprising links 16 and 17, the link 16 being pivotallyattached-at 18 to the standard 2 and to the lower end of the link 17 by a thumb screw 19 passing through an opening in one link and through a longitudinal slot in the other link, the upper end of the link 17 being formed with aneye 20 to receive the arm 11 of the guide frame. The closed end 12 of the guideframe is thus adjustably supportedby these links 16 and 17 and the opposite end ofthe armor mem- V 7 berlO of the frame is adjustably supported by an arm 21 rigidly secured to the head 8 and extending outwardly therefroiuand a link 2 attached to the outer end of said arm by a screw 28 passing through an opening-in the arm and a longitudinal slot in the link, which'link is formed with an eye 24 at its. outer end to receive the free end of the guide arm 10 of theguide frame.

To carry and guide a skate to-be sharpened,'a table 25 is provided to slide upon the guide rod or arm 10, saidtable being formed with downwardly extending ears 26 havingopenings to receive the rod and slide longitudinally thereof. To prevent tiltlng of the table upon said guide rod, an arm 27 extends laterally therefrom toward the arm 11 and has a curved end portion to overlie the rod with an adjusting screw 28 carried by said end to engage the rod and ride thereon during the reciprocating movement of the table.

The table is thus prevented from tilting or turning on the rod 10 toward the grind ing wheel but is free to rotate in an opposite direction or away from the wheel.

On the upper flat faceof the table is a plate 29 formed with a pair of upwardly and laterally curved arms 30, the free ends of which extend adjacent to the grinding wheel and are provided with outwardlv turned ends forming seats 31 for the blade 32 0f a skate to be sharpened, and carried by each arm to oppose eachseat is a clamp ing screw 33 to engage the upper side of the skate blade or runner and clamp the same firmly in place upon its seat.

The plate 29 is attached to the table 25 by a single centrally positioned vertical pivot "in the form of a screw provided with a thumb-nut 34, the screw being secured to the table and extending upward through a transverse slot 35 in the plate. This plate with'its skate carrying means 30 may therefore be turned or swung upon the table about its vertical pivot while being guided in its longitudinal movement upon the guide member 10 of the frame, to present the curved end portions of a skate runner to the grinding wheel. By slackening the thumb nut 34 on its screw, this plate 29 may he slid transversely upon its table to adjust the skate toward or from the grinding wheel.

The guide member 10 upon which the table 25 slides, maybe adjusted by means of the screw 23 to bring this member exactly parallel with the face of the grinding wheel and the adjustable links 16 and 1'7 may be adjusted to vary the height of the closed end of the supporting frame to bring tl e frame into a true horizontal position at right angles to the grinding iwheel, and therefore the position of the skate runner may be varied to bring it in proper relation to the wheel so that said wheel will grind exactly atright angles to the blade and give a true even cut, grinding the runner with a slight concave, due to the circular form of the grinding surface of the wheel cutting at exactly right angles to the blade.

With this device, skate runner may be very accurately ground with a slight concave, by an inexperienced workman, and the grinding apparatus found in most shoe repair shops may be utilized for the purpose, the device being cheap to manufacture and quickly attachable to or detachable from such. machine, and the wor; may be very expeditiously performed as the skate is ac curately held and guided relative to the grinding wheel, and it is only necessary for the operator to move the table iorth upon its guide and swing slightly, by grasping the two Because of the manner in which is held, the operatormay have structed view of the work during the plate arms 30. the skate the grinding operation, and thus is enabled to perform a true even grinding operation.

Obviously changesmay be made in the particular form or construction of the atcomprising a guide frame, means for attaching said guide frame to a grinding machine, reciprocable means guided by vsaid.

frame, and holding, means carried by said reciprocable means for holding a skate to, 0

relation to agrinding wheel of the grinding present the blade thereof in right angular machine, said reciprocable means being rockable upon said frame transversely of its:re ciprocating movement to move the skate held thereby toward ,and from. the wheel, and said holding means being turnable about an upwardly extending axis relative to the frame 'to present a curved surface of the skate to the grinding wheel during the reciprocatory movement.

2. An attachment for grinding'machines comprising aguideframe, a table reciprocable upon and guided by said frame,means for detachably attaching said frame to a grinding machine to guide said table in-its reciprocation at rightiangles to the plane of rotation of a grinding wheel of the grinding machine, a skate holding and guiding member pivotally secured to said table'to swing about an upwardly extending axis during reciprocation and provided with spaced laterally-extending arms, and clamp,- ing means on the free ends of said arms'for holding a skate.

3. An attachment for grinding machines comprising a guide frame including a guide arm, means for adjustably and 'detacha-bly securing said frame to a grinding machine, a table having ears provided with openings to receive said guide arm and slide and rock thereon, means for holding said table against rocking uponsaid arm, and means on the table for holding and guiding a skate during reciprocation of said table.

a. An attachment for grinding machines comprising a guide frame having a guide arm and a guide parallel with said arm, a work carrying member reciprocable and rockable upon said guid arm and havinga member extendinglaterally over said parback and an unoballel guide to engage the same and prevent rocking in one direction of said work carrying member upon said guide arm, and means on said work carrying member at the side thereof from which the laterally extending member'extends, for detachably holding the work.

5. An attachment for grinding machines including a guide frame having parallel spaced guide arms, means for attaching said frame to a grinding machine, a work carrying table slidable and rockable'upon one of said guide arms, means, on said table extending laterally over the other of said guide arm to prevent rocking of the table in one direction, and work supports on the table extending toward said last named guide arm.

6. An attachment for grinding machines including a supporting and guiding frame having parallel guide rods, means for deon said arm to engage and rest upon said last named guide rod and prevent rocking of the table in one direction during its'reciprocation, a plate seated upon said table and pivotally attached thereto to swing thereon, work carrying arms on the plate extending upwardly and laterally therefrom toward the guide rod supporting said arm on the table, and clamping'means on the free ends of said work carrying arms.

In testimony whereof I affix my signature in presenceof two witnesses.

r SVEN' E. STROM.

Witnesses:

LEWIS E. FLANDERS, ANNA M. DORR. 

